软件资料库
将来，我估计要换台电脑，但是有一对使用频率很低但是容易忘记的软件，这里来记录一下
PDF叠加
将两个PDF叠加起来，效果如下图所示。用它的主要原因是Goodnote导出的PDF会让原本识别出来的中文乱码，将笔迹单独导出并与原文件叠加可以实现效果，而且不会出现乱码
这里可以使用python库PyPDF4实现，首先在命令行进行安装
pip install PyPDF4
然后新建一个py代码文件，运行即可
from PyPDF4 import PdfFileWriter, PdfFileReader
def create_watermark(input_pdf, output, watermark):
watermark_obj = PdfFileReader(watermark)
pdf_reader = PdfFileReader(input_pdf)
pdf_writer = PdfFileWriter()
for i in range(pdf_reader.getNumPages()):
page = pdf_reader.getPage(i)
page.mergePage(watermark_obj.getPage(i))
pdf_writer.addPage(page)
with open(output, 'wb') as out:
pdf_writer.write(out)
if __name__ == '__main__':
create_watermark(
input_pdf = r'C:\Users\Administrator\Desktop\PDF_demp.pdf',
output = r'C:\Users\Administrator\Desktop\watermarked_pdf.pdf',
watermark = r'C:\Users\Administrator\Desktop\watermark.pdf')
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